How to re-generate expired ssl certificate in esx 4.0

Hello,

I want to re-generate, expired ssl certificate in esx 4.0.

I have reffered this :

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009092

-copied rui.key, from v-center to laptop where open ssl is intsalled

- now from where should I run this command "

• openssl.exe req -new -x509 -days 3650 -sha1 -nodes -key rui.key -out rui.crt -subj "fqdn_of_VC"

its not working from the folder of that copied certificate or from c://openssl

Thanks in advance